Database-first,model-first,code-first

1.Database first is based on existing databases, using some tools (such as the EF Designer provided by VS) to create entity classes, matching relationships between database objects and entity classes, and so on, you can also manually modify these automatically generated code and matching files.

2.Model first this approach is to use some tools (such as the EF Designer vs) to design the Entity Data model and the relationship between them, and then based on these entities, relationships to generate database objects and related code files.

3.Code First This approach involves writing code, such as entity objects, data relationships, and then automatically creating data objects based on existing code descriptions, but this approach is very similar to model one. The code we write ourselves is actually a code representation of the entity model, and model first describes the entity model in a visual way.

Database-first,model-first,code-first